Annotation of wikisrc/users/maya/vax-gcc.mdwn, revision 1.7

1.1       maya        1: # Various GCC/vax issues and invesigation #
                      2: 
1.4       maya        3: ## libgomp crash with -O2 ##
1.1       maya        4: Repro:
                      5: 
1.2       maya        6:     #!/bin/sh
                      7:     
                      8:     cat << EOF > oacc.i
                      9:     int a, b;
                     10:     int e() {
                     11:       short *c = 0;
                     12:       char d = c[a + 1];
                     13:       b = d;
                     14:       a += 2;
                     15:     }
                     16:     EOF
                     17:     vax--netbsdelf-gcc -O2 -c oacc.i
                     18: 
1.1       maya       19: Asserts at emit-rtl.c:2310 gcc_assert (memory_address_addr_space_p (mode, addr, as));
                     20: 
1.6       maya       21: NetBSD avoids it with a [local diff](https://github.com/NetBSD/src/commit/e437e96750193b86d0464965661f616e011056fa) to reload.c/dse.c.  
1.3       maya       22: It looks like a real bug in vax_legitimate_address_p not handling some addressing modes.  
1.2       maya       23: The code to handle offset(reg)[index] might be off: it doesn't like if neither xfoo0, xfoo1 are constant.
1.4       maya       24: 
                     25: ## unrecognizable insn with any optimization ##
                     26: 
                     27: Repro:
                     28: 
1.5       maya       29:     #!/bin/sh
1.4       maya       30: 
                     31:     cat << EOF > decl.ii
                     32:     struct a {
                     33:       long long *b() const;
                     34:     };
                     35:     template <typename> class d : a {
                     36:     public:
                     37:       template <typename e> d(e);
                     38:       long long f() const;
                     39:     };
                     40:     template <typename c> long long d<c>::f() const {
                     41:       int g;
                     42:       return b()[g];
                     43:     }
                     44:     int h;
                     45:     bool i() {
                     46:       d<int> j(h);
                     47:       return j.f();
                     48:     }
                     49:     EOF
                     50:     vax--netbsdelf-g++ -O2 -c decl.ii
                     51: 
1.7     ! maya       52: This errors out with:
        !            53: 
        !            54:     $ env PATH=$PWD:$PATH ./xgcc -fno-use-linker-plugin -c -O2 ~/oacc/decl.ii -fno-tree-vectorize
        !            55:     /home/fly/oacc/decl.ii: In function 'bool i()':
        !            56:     /home/fly/oacc/decl.ii:17:1: error: unrecognizable insn:
        !            57:        17 | }
        !            58:           | ^
        !            59:     (insn 13 12 14 2 (set (reg:SI 33)
        !            60:             (subreg:SI (mem:DI (plus:SI (mult:SI (reg/v:SI 24 [ g ])
        !            61:                             (const_int 8 [0x8]))
        !            62:                         (reg/f:SI 23 [ _6 ])) [1 *_10+0 S8 A32]) 4)) "/home/fly/oacc/decl.ii":16:14 -1
        !            63:          (nil))
        !            64:     during RTL pass: vregs
        !            65:     /home/fly/oacc/decl.ii:17:1: internal compiler error: in extract_insn, at recog.c:2310
        !            66:     
        !            67: Providing a trivial scheduling will avoid subregs of mem.

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